Book/Dissertation / PhD Thesis

FZJ-2020-00464

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Studies of oxidation resistant tungsten alloys at temperatures of 1100 K to 1475 K

Klein, F. (Corresponding author)FZJ*

2019
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-444-7

Please use a persistent id in citations: http://hdl.handle.net/2128/24174  urn:nbn:de:0001-2020102032

Abstract: Electricity from nuclear fusion is a promising approach. An accidental scenario of a fusion power plant assumes a loss of coolant and a damaged reactor vessel. In this case temperatures beyond 1200K of the plasma-facing materials are expected. This thesis investigates W-Cr-Y alloys to provide safety after such an accident. It is shown how Cr forms an oxide layer by diffusion that suppresses the release of WO$_{3}$ at temperatures up to 1273K in dry and humid air. Suppression by more than one order of magnitude as compared to W is measured for the first time. Y is issential for suppression of WO$_{3}$ release and is detected for the first time at the oxide grain boundaries and in the form of YCrO$_{3}$ nano-particles. An understanding of the oxidation in dependence on morphology, microstructure, composition and the envronmental conditions is developed using experimental and theoretical studies of the interaction of the involved elements.

Note: Dissertation, Universität Bochum, 2019

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Contributing Institute(s):

1. Plasmaphysik (IEK-4)

Research Program(s):

1. 174 - Plasma-Wall-Interaction (POF3-174) (POF3-174)

Appears in the scientific report 2019

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